Fig 4. Shaking and grooming accelerometer signal.

Shaking behavior of a lactating northern fur seal indicated by the brief signal in the accelerometer values that reach beyond-30 and 30 indicating that the forces were greater than the maximum and minimum recordable by the instruments. The top two panels (A and B) show a common time that shaking occurred between foraging dives, and the bottom two panels (C and D, an expansion of the shaded area in panels A and B) show a detail of this pattern of shaking that was often associated with grooming where the animal spends a few seconds on one side, rolling over on the other for a few seconds, and periodically shaking.